1、 IEC 60885-3 Edition 2.0 2015-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical test methods for electric cables Part 3: Test methods for partial discharge measurements on lengths of extruded power cables Mthodes dessais lectriques pour les cbles lectriques Partie 3: Mthodes dessais pour la
2、mesure des dcharges partielles sur des longueurs de cbles de puissance extruds IEC 60885-3:2015-04(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any
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20、ALE Electrical test methods for electric cables Part 3: Test methods for partial discharge measurements on lengths of extruded power cables Mthodes dessais lectriques pour les cbles lectriques Partie 3: Mthodes dessais pour la mesure des dcharges partielles sur des longueurs de cbles de puissance ex
21、truds INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.060.20 ISBN 978-2-8322-2582-0 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained thi
22、s publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 60885-3:2015 IEC 2015 CONTENTS FOREWORD . 4 1 Scope 6 2 Normative references. 6 3 Terms, definitions and symbols 6 3.1 Terms and definitions 6 3.2 Symb
23、ols used in Figures 1 to 14 6 4 Overview . 7 4.1 General . 7 4.2 Object . 7 4.3 Problem of superposition of travelling waves for long lengths . 7 5 Partial discharge tests . 10 5.1 Test apparatus 10 5.1.1 Equipment . 10 5.1.2 Test circuit and instruments 10 5.1.3 Double pulse generator 10 5.1.4 Term
24、inal impedance . 10 5.1.5 Reflection suppressor 10 5.2 Setting up the test circuit . 10 5.2.1 Determination of characteristic properties of the test circuit . 10 5.2.2 Terminal impedance . 10 5.2.3 Determination of superposition of travelling waves 11 5.2.4 Reflection suppressor 11 5.2.5 Calibration
25、 of the measuring system in the complete test circuit 11 5.2.6 Sensitivity 11 5.3 Measurement procedures 11 5.3.1 General . 11 5.3.2 Short cable lengths including type test lengths 12 5.3.3 Long cable lengths tested without a terminal impedance . 12 5.3.4 Long cable lengths tested with a terminal im
26、pedance 13 5.3.5 Long cable lengths tested with a reflection suppressor 14 5.4 Voltage levels/partial discharge limits 15 5.5 Double pulse behaviour and plotting the double pulse diagram . 15 5.6 Requirements for the terminal impedance 16 5.6.1 General . 16 5.6.2 RC element 16 5.6.3 RLC element seri
27、es resonance circuit . 17 Bibliography . 21 Figure 1 Discharge site exactly at the cable end remote from the detector (x = l) . 7 Figure 2 Discharge site at a distance x = x 1 Travelling waves 8 Figure 3 Attenuation of PD pulses along the cable 8 Figure 4 Superposition and attenuation of PD pulses 9
28、 Figure 5 Input unit Z Aconnected in series with the coupling capacitor, C K17 Figure 6 Input unit Z Aconnected in series with the cable, C x18 Figure 7 Bridge circuit 18 IEC 60885-3:2015 IEC 2015 3 Figure 8 Connection of the terminal impedance Z w. 18 Figure 9 Connection of the reflection suppresso
29、r, RS 19 Figure 10 Connection of the double pulse generator into the measuring circuit in Figure 5 19 Figure 11 Double pulse diagram type 1 without negative superposition 19 Figure 12 Double pulse diagram type 2 with negative superposition between t 1and t 2. 20 Figure 13 Double pulse diagram type 3
30、 with negative and positive superpositions between t 1and t 2. 20 Figure 14 Connection of the double pulse generator for the test circuit in Figure 9 with the reflection suppressor 20 4 IEC 60885-3:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL TEST METHODS FOR ELECTRIC CABLES
31、Part 3: Test methods for partial discharge measurements on lengths of extruded power cables FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC
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41、nsable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60885-3
42、has been prepared by IEC technical committee 20: Electric cables. This second edition of IEC 60885-3 cancels and replaces the first edition, published in 1988 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
43、 The definition of sensitivity as twice the background noise level has been removed and replaced by a practical assessment of sensitivity based on the minimum level of detectable discharge. References to measurements of pulse heights in mm on an oscilloscope have been replaced by measurements of par
44、tial discharge magnitude in pC. IEC 60885-3:2015 IEC 2015 5 The order of the clauses has been revised in line with the general numbering scheme of IEC standards and to provide clarity in order to facilitate its practical use. Section 3 of the first edition (Application guide) has been removed as it
45、is considered that background information is better obtained from the original references as listed in the bibliography. The text of this standard is based on the following documents: FDIS Report on voting 20/1560/FDIS 20/1587/RVD Full information on the voting for the approval of this standard can
46、be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60885 series, published under the general title Electrical test methods for electric cables, can be found on the IEC webs
47、ite. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a
48、revised edition, or amended. 6 IEC 60885-3:2015 IEC 2015 ELECTRICAL TEST METHODS FOR ELECTRIC CABLES Part 3: Test methods for partial discharge measurements on lengths of extruded power cables 1 Scope This part of IEC 60885 specifies the test methods for partial discharge (PD) measurements on length
49、s of extruded power cable, but does not include measurements made on installed cable systems. Reference is made to IEC 60270 which gives the techniques and considerations applicable to partial discharge measurements in general. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated
